Tourmaline Properties
Tourmaline Properties loose sale price & Tourmaline Gemstone Information
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PROPERTIES
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Refractive Index 1.624-1.644
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Hardness = 7-7.5 (Moh's Scale)
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Specific Gravity =3.06
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Species - Tourmaline.
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Optic Character - Double Refraction.
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Phenomena - Chatoyancy,
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color change (rare).